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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   * 
   * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
   * 
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License. You can obtain
  * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
  * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  * 
  * When distributing the software, include this License Header Notice in each
  * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
  * Sun designates this particular file as subject to the "Classpath" exception
  * as provided by Sun in the GPL Version 2 section of the License file that
  * accompanied this code.  If applicable, add the following below the License
  * Header, with the fields enclosed by brackets [] replaced by your own
  * identifying information: "Portions Copyrighted [year]
  * [name of copyright owner]"
  * 
  * Contributor(s):
  * 
  * If you wish your version of this file to be governed by only the CDDL or
  * only the GPL Version 2, indicate your decision by adding "[Contributor]
  * elects to include this software in this distribution under the [CDDL or GPL
  * Version 2] license."  If you don't indicate a single choice of license, a
  * recipient has the option to distribute your version of this file under
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
  */
 
 /*
  * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 //----------------------------------------------------------------------------
 //
 // Module:      LogLSN.java
 //
 // Description: Log sequence number.
 //
 // Product:     com.sun.jts.CosTransactions
 //
 // Author:      Simon Holdsworth
 //
 // Date:        March, 1997
 //
 // Copyright (c):   1995-1997 IBM Corp.
 //
 //   The source code for this program is not published or otherwise divested
 //   of its trade secrets, irrespective of what has been deposited with the
 //   U.S. Copyright Office.
 //
 //   This software contains confidential and proprietary information of
 //   IBM Corp.
 //----------------------------------------------------------------------------
 
 package com.sun.jts.CosTransactions;
 
 // Import required classes
 
 import java.io.*;

A structure containing 2 unsigned integers. extent: the extent file number offset: the offset within the extent file

Author(s):
Simon Holdsworth, IBM Corporation
Version:
0.01
See also:
 
 //----------------------------------------------------------------------------
 // CHANGE HISTORY
 //
 // Version By     Change Description
 //   0.01  SAJH   Initial implementation.
 //-----------------------------------------------------------------------------
 
 class LogLSN implements Serializable {

    
Constants for particular LSN values.
 
     static final LogLSN HEAD_LSN  = new LogLSN(0xFFFFFFFF, 0xFFFFFFFF);
     static final LogLSN TAIL_LSN  = new LogLSN(0xFFFFFFFF, 0xFFFFFFFE);
     static final LogLSN NULL_LSN  = new LogLSN(0x00000000, 0x00000000);
     static final LogLSN FIRST_LSN = new LogLSN(0x00000001, 0x00000000);

    
This constant holds the size of the LogRecordEnding object.
 
     static final int SIZEOF = 8;

    
Internal instance members.
    int offset = 0;
    int extent = 0;

    
Default LogLSN constructor

Parameters:
Returns:
See also:
    LogLSN() {
         = 0;
         = 0;
    }

    
LogLSN constructor

Parameters:
ext Extent for new LSN.
off Offset for new LSN.
Returns:
See also:
    LogLSNint ext,
            int off ) {
         = off;
         = ext;
    }

    
LogLSN constructor

Parameters:
lsn Other LSN to be copied.
Returns:
See also:
    LogLSNLogLSN lsn ) {
         = lsn.offset;
         = lsn.extent;
    }

    
Constructs a LogLSN from the given byte array.

Parameters:
bytes The array of bytes from which the LogLSN is to be constructed.
index The index in the array where copy is to start.
Returns:
See also:
    LogLSNbyte[] bytes,
            int  index ) {
         =  (bytes[index++]&255) +
            ((bytes[index++]&255) << 8) +
            ((bytes[index++]&255) << 16) +
            ((bytes[index++]&255) << 24);
         =  (bytes[index++]&255) +
            ((bytes[index++]&255) << 8) +
            ((bytes[index++]&255) << 16) +
            ((bytes[index++]&255) << 24);
    }

    
Determines whether the target LSN is NULL.

Parameters:
Returns:
See also:
    final boolean isNULL() {
        return  == 0 &&  == 0;
    }

    
Determines whether the given LSN is equal to the target.

Parameters:
other The other LogLSN to be compared.
Returns:
See also:
    final boolean equalsLogLSN other ) {
        return  == other.offset &&  == other.extent;
    }

    
Determines whether the target LSN is less than the parameter.

Parameters:
other The other LogLSN to be compared.
Returns:
See also:
    final boolean lessThanLogLSN other ) {
        return ( ( < other.offset &&  == other.extent) ||
                  < other.extent);
    }

    
Determines whether the target LSN is greater than the parameter.

Parameters:
other The other LogLSN to be compared.
Returns:
See also:
    final boolean greaterThanLogLSN other ) {
        return ( ( > other.offset &&  == other.extent) ||
                  > other.extent);
    }

    
makes the target LSN a copy of the parameter.

Parameters:
LogLSN The LSN to be copied.
Returns:
See also:
    final void copyLogLSN other ) {
         = other.extent;
         = other.offset;
    }

    
Makes a byte representation of the LogLSN.

Parameters:
bytes The array of bytes into which the LogLSN is to be copied.
index The index in the array where copy is to start.
Returns:
Number of bytes copied.
See also:
    final int toBytesbyte[] bytes,
                       int  index ) {
        bytes[index++] = (byte;
        bytes[index++] = (byte)( >> 8);
        bytes[index++] = (byte)( >> 16);
        bytes[index++] = (byte)( >> 24);
        bytes[index++] = (byte;
        bytes[index++] = (byte)( >> 8);
        bytes[index++] = (byte)( >> 16);
        bytes[index++] = (byte)( >> 24);
        return ;
    }

    
This method is called to direct the object to format its state to a String.

Parameters:
Returns:
The formatted representation of the object.
See also:
    public final String toString() {
        return "LSN(ext="/*#Frozen*/++",off="/*#Frozen*/++")"/*#Frozen*/;
    }
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